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Structural retrofitting of RC slabs using bamboo fibre laminate: Flexural performance and crack patterns
Paul O Awoyera1, Fadi Althoey2, Alireza Bahrami3
1Department of Civil Engineering, Covenant University, Ota, Nigeria.
Heliyon
|January 31, 2024
Summary
Bamboo fibre laminate (BFL) retrofitting significantly enhances the flexural strength and durability of reinforced concrete slabs. This sustainable approach effectively minimizes cracking and improves load-bearing capacity in structural elements.
Area of Science:
- Civil Engineering
- Materials Science
- Structural Engineering
Background:
- Structural element durability is key to civil engineering sustainability.
- Slab degradation due to cracking and deformation under load reduces functionality.
- Retrofitting with local materials can improve slab performance.
Purpose of the Study:
- To evaluate the flexural performance of reinforced concrete (RC) slabs retrofitted with bamboo fibre laminate (BFL).
- To investigate the impact of ceramic aggregate replacement on slab performance.
- To assess the effectiveness of combined external bonding and near surface-mounted retrofitting techniques.
Main Methods:
- Twelve RC slab samples (300mm x 300mm x 50mm) were prepared: six non-retrofitted and six retrofitted with BFL.
- Two aggregate replacement methods were used: fine aggregate with ceramic fine aggregate, and coarse aggregate with ceramic coarse aggregate.
- Slabs were tested using a three-point bending system; non-destructive tests were also performed.
Main Results:
- Retrofitted slabs with a conventional mix showed a 60.76% increase in ultimate failure load and flexural strength (62.1 kN) compared to non-retrofitted slabs.
- Analysis included flexural and diagonal shear cracks, and BFL debonding.
- Non-destructive tests corroborated the findings.
Conclusions:
- Bamboo fibre laminate (BFL) is a sustainable retrofitting material that significantly enhances RC slab performance.
- The study provides valuable insights for developing and applying BFL for improved structural durability.
- Retrofitting effectively mitigates deflection and crack propagation, boosting flexural capacity.
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